Intercept an HTTP request at browser end to alter some html content

Question

I would like to do as follows. What would be the best way? A general answer will also be fine.

I would like to intercept an HTTP request at the client end to alter some

Answer 1

Are you saying you want to intercept this for your own site?

In any case, it needs to be done in javascript or jQuery as C# is not a client-side language.